Roccat kaves?

Hey i was going to get some roccat kaves for birthday, and i was looking at forums for what sound card, because people say get pricey ones and some people say get cheap ones, the forum said to get asus xonar d1 7.1 and its meant to be very good with the roccat kaves, but the kaves are 5.1 and the sound card is 7.1 , will this work? and if so or not any suggestions on what sound card to get, whats a decent price? btw im not much of a techy person so can you not go into great detail for me not to understand please.